returns unmodifiable sets#1071

Merged

stephengold merged 2 commits intojMonkeyEngine:masterfrom

rvandoosselaer:refactor-collection-to-set-in-AnimComposer

Apr 22, 2019

Commits on Apr 17, 2019

returns an unmodifiable set when retrieving the available animation names and available animation clips instead of an unmodifiable collection. fixes: #1070
rvandoosselaer
committed

Commits on Apr 18, 2019

remove unnecessary set wrapper.
rvandoosselaer
committed